Vehicles trapped underneath a span from the collapsed walkway across the main highway after it was hit by the high load of a truck passing underneath it.(Photo from Ang Thong province's community Facebook page Chaeng Khao Sarn Ang Thong)

A pedestrian overpass across Highway 334 collapsed after it was hit by a backhoe loaded on a 22-wheel truck attempting to passing beneath it on Tuesday, injuring one person and damaging several cars.

The collapsed bridge blocked one side of the highway, bringing traffic to a halt.

The accident occurred about 11am near kilometre marker 50 in tambon Tha It of Ang Thong's Muang district, in front of a petrol station on the North-bound side of the highway.

An entire span of the walkway fell on to the highway.

Some vehicles were trapped and one person was reported injured. No further details were available.